Editing Escape sequence (section)

==Modem control==
The [[Hayes command set]], for instance, defines a single escape sequence, ''[[+++ (modem)|+++]]''. (In order to interpret ''+++'', which may be a part of data, as the escape sequence, the sender stops communication for one second before and after the ''+++''.) When the modem encounters this in a stream of data, it switches from its normal mode of operation, which simply sends any characters to the phone, to a command mode in which the following data is assumed to be a part of the command language. You can switch back to the ''online mode'' by sending the O command.

The Hayes command set is [[Mode (user interface)|modal]], switching from command mode to online mode.<ref name="Modem_2011"/><ref name="Modem_Programming"/> This is not appropriate in the case where the commands and data will switch back and forth rapidly. An example of a non-modal escape sequence control language is the [[VT100]], which used a series of commands prefixed by a [[Control Sequence Introducer]].